A wave-resistant structure resulting from cementation processes and the skeletal construction of hermatypic corals, calcareaous algae, and other carbonate-secreting organisms. (Source: NOAA)

Coral reefs are built up from the skeletons of reef-building coral, a small primitive marine animal, and other marine animals and algae over thousands of years [...]. (Source: GEMET/WRIGHT)

Alternative labels:
coral bleaching
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